Bridge of furnaces for boilers.



BATEN'I'ED APR. 7, 1903.

R. 1 V'STURROOK. BRIDGE 0F FURNACES FOR BOILERS.

APPLICATION FILED. HA3. 3, 1902.

a SHEETS-SHEET 1 4 no 110mm.

Fic.

IW/Wessefi. I

WWW:

.PA'TENTED APR. 7, 190s,-."

R. I. STUR ROGK. BRIDGE OF FURNACES FOR BOILERS.

APPLICATION FILED MAB. 3, 1902.

3 SHEETS-SHEET 2.

NOMODEL.

7 Saran-k w W M m 4M n w m 7\ W W J'HE-NORRVS ETERS 00., PHOTD-LITHQ, wAsmNuTou. n. cy

No. 724,517. PATENTED APR. 7, 1903.

R. F. STURROGK. BRIDGE 0F FURNACES FOR BOILERS.

APPLICATION FILED MAR. 31 1902.

3 SHEETS-SHEET 3.

N0 MODEL.

1 r\ V EZQJ Q s/ F1225- o o o i f7c,4. f fi m. M.

W JV. an... ,,P 7 4.

THE scams warns co. PHo'ro-uma. wssnwurou. o. c.

7 support for the bridge-bars; and Fig. 5 is a ,for shipping and locking the bars.

UNITED STATES PATENT OFFICE.

ROBERT FINDLAY STURROCK, OF DUNDEE, SCOTLAND.

BRIDGE OF FURNACES FOR BOILERS.

SPECIFICATION forming part of Letters Patent No. 724,517, dated April '7, 1903.

Application filed March 3, 1902.

To all whom, it may concern:

Beit known that I, ROBERT FINDLAY STUR- ROCK, a subject of the King of Great Britain and Ireland, and a resident of Dundee, in the county of Forfar, Scotland, (whose post-office address is 3 Rustic Place,) have invented Improvements in Bridges of Furnaces for Boilers, of which the following is a specification.

This invention relates to improvements in the bridges of furnaces for boilers, the object being to thoroughly burn the products of combustion by admitting and heating air in a new and improved manner and incidentally to permit of clinkers being more easily removed than hitherto obtains.

In order that .my said invention and the manner of performing or carrying the same into efiect or practice may be properly und erstood, I have hereunto appended three explanatory sheets of drawings, in which the same reference-numerals are used to indicate corresponding parts in all the figures where shown.

Figure 1 is a part longitudinal section through a boiler furnace or flue, showing the bridge in position. Fig.2 is a cross-section of a boiler furnace or flue, the one half being a section at A A and the other half at B B, Fig. 1. Fig. 3 is a plan of the foundation cross-plate. Fig. 4: is a part face view of the section at C C, Fig. 4, showing the aperture In carrying out my invention I attach the foundation cross-plate 10 to the inner end of the flue 11 by means of the brackets 12 and bolts 13, such foundation cross-plate being provided with suitable air-apertures 14. To the cross-plate 10 is bolted the support 15 for the bridge-bars 16. The cross-plate and the bridge-bars are sodesigned and made that they can be threaded ontothe bulb of the support 15 by means of the'aperture 20, the bridge-bars in their first and entering position being shown'by the dotted lines in Fig. 5. The bars are provided with recesses or notches of different depths, whereby the bars when assembled form apertures of varying Serial No. 96,535. (No model.)

sizes, the largest, 17, being nearest the foundation-plate 10,'the second and smaller, 18,

being immediately above, and the third, 19, at or near the crown. These bars 16 are not otherwise held, their lower extremities simply resting on the foundation-plate 10 in order that they may expand freely.

The action of my improved bridge or arch is as follows: The air passes up through the apertures 14 in the foundation-plate in the direction shown by the arrows and through the three assembled apertures 17, 18, and 19 between the bars, and in its passage it gets heated to such an extent that it readily combines with the products of combustion coming from the furnace, thus assuring their combustion. The passage of such air between the bars keeps them from being unduly heated, and thus renders them less liable to de teriorate too rapidly. From the formation and the manner of setting these bars clinkers may be quite easily cleared out.

Although I have for the purpose of illustrating my invention shown one way of carrying out the same, yet the details of the various parts may be altered and modified to suit varying conditions without in any way departing from my invention.

What I claim as my invention, and desire to secur e by Letters Patent, is-

1. In a furnace, the combination of a grate, a perforated foundation-plate, a verticallydisposed supporting-plate secured to the rear end of the foundation-plate, and a series of inclined bridge-bars, supported at their upper ends by the supporting-plate and at their lower ends by the foundation-plate, the sides 'of said bars being provided with recesses or notches of different depths, whereby when the bars are assembled openings of various sizes are formed between the bars, said openings decreasing in size from the'bottom upward, substantially as described.

2. In a furnace, the combinationof a grate, a perforated foundation-plate, a verticallydisposed supporting-plate secured to the rear end of the foundation-plate and having a medially-situated aperture for allowing the bars to be threaded on; and a series of inings decreasing in size from the bottom up clined bridge-bars, supported at their-upper ward, substantially as described. :0 ends by the supporting-plate and at their In witness whereof I have hereunto set my lower ends by the foundation-plate, the sides hand in presence of two Witnesses.

of said bars being provided with recesses or ROBERT FINDLAY STURROCK. notches of different depths, whereby when Witnesses: 1 the bars are assembled openings of various AGNES DOUGLAS,

sizes are formed between the bars, said open- JOHN BROUGH. 

